名校
解题方法
1 . 对于项数为
的有穷数列
,设
为
中的最大值,称数列
是
的控制数列.例如数列3,5,4,7的控制数列是3,5,5,7.
(1)若各项均为正整数的数列
的控制数列是2,3,4,6,6,写出所有的
;
(2)设
是
的控制数列,满足
(
为常数,
).证明:
.
(3)考虑正整数
的所有排列,将每种排列都视为一个有穷数列
.是否存在数列
,使它的控制数列为等差数列?若存在,求出满足条件的数列
的个数;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/686ece75006ad358f23314dc8a246e11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/332a51673c2ae8b003e5f31b71579617.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(1)若各项均为正整数的数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c8a59672f406ba5b297ecabbba62bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2156cba674f50d2c546502b4a2ed929.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdf0bd1c527c68be985fa95ff6354fe0.png)
(3)考虑正整数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5aa2de6deb84e4a63b9797d47033a66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
您最近一年使用:0次
2022-04-18更新
|
563次组卷
|
4卷引用:上海市复兴高级中学2022届高三下学期3月练习数学试题
上海市复兴高级中学2022届高三下学期3月练习数学试题广东省阳江市2022-2023学年高二上学期期中数学试题(已下线)北京市海淀区2023届高三上学期期末练习数学试题变式题16-212024届高三新高考改革数学适应性练习(九省联考题型)
名校
解题方法
2 . 已知函数
,无穷数列
满足
,
.
(1)若
,写出数列
的通项公式(不必证明);
(2)若
,且
,
,
成等比数列,求
的值;问
是否为等比数列,并说明理由;
(3)证明:
,
,
,
,
成等差数列的充要条件是
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9ae4c96befd0583a42ba46a7470a49d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c6aa8089b5d9b722aff679af3c4d289.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/039e4fe671d61e59b96ee525c9df43e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/390636a89883bd64bf8da9bf8654aff9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c1ccc6c74b8754e9bcbb3f39a11b6f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
(3)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daa5e9bd516f6282483b92cfe6074623.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daa5e9bd516f6282483b92cfe6074623.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
您最近一年使用:0次
2021-12-20更新
|
424次组卷
|
2卷引用:上海财经大学附属北郊高级中学2023届高三上学期开学考试数学试题
名校
3 .
是由实数构成的无穷等比数列,
,关于数列
,给出下列命题:①数列
中任意一项均不为0;②数列
中必有一项为
;③数列
中或者任意一项不为
;或者无穷多项为
;④数列
中一定不可能出现
;⑤数列
中一定不可能出现
;其中正确的命题是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f65d309e18d563b1619d0ccf98cb1358.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/846fa57d92d6ad44d6a0cafad1e71ed4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/846fa57d92d6ad44d6a0cafad1e71ed4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/846fa57d92d6ad44d6a0cafad1e71ed4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c95b6be4554f03bf496092f1acdfbb89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/846fa57d92d6ad44d6a0cafad1e71ed4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c95b6be4554f03bf496092f1acdfbb89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c95b6be4554f03bf496092f1acdfbb89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/846fa57d92d6ad44d6a0cafad1e71ed4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95d9f0dfc997f7ed26e304b41c28b571.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/846fa57d92d6ad44d6a0cafad1e71ed4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa17a1a1d3a3869b5a4ae807aaf85d82.png)
A.①③ | B.②④ | C.③⑤ | D.②⑤ |
您最近一年使用:0次
2021-01-09更新
|
722次组卷
|
4卷引用:上海市外国语大学附属外国语学校2020-2021学年高二上学期12月月考数学试题
上海市外国语大学附属外国语学校2020-2021学年高二上学期12月月考数学试题(已下线)4.3等比数列(B 能力培优练)-2021-2022学年高二数学同步双培优检测(苏教版2019选择性必修第一册)(已下线)4.2 等比数列的前n项和(第2课时)(作业)(夯实基础+能力提升)-【教材配套课件+作业】2022-2023学年高二数学精品教学课件(沪教版2020选择性必修第一册)(已下线)专题7 等比数列的性质 微点1 等比数列项的性质
名校
解题方法
4 . 对于定义域为R的函数
,部分
与
的对应关系如表:
![](https://img.xkw.com/dksih/QBM/2020/5/9/2459073485799424/2461415147413504/STEM/1c00d3f730464fc383df57208b11693b.png?resizew=554)
(1)求
:
(2)数列
满足
,且对任意
,点
都在函数
的图象上,求![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d9cec7702a95b5f3378a37d3609da02.png)
(3)若
,其中
,求此函数的解析式,并求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://img.xkw.com/dksih/QBM/2020/5/9/2459073485799424/2461415147413504/STEM/1c00d3f730464fc383df57208b11693b.png?resizew=554)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6f47f38e17214e09803e8c12dac0e83.png)
(2)数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e976c0663fa749ca749f99842d21ca03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0736457346c11dd6f458418a4f747ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/302b13a66072fb0e9bc6eb06a2bef202.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d9cec7702a95b5f3378a37d3609da02.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de1ec6a7d80a53277f35f247ac31db65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d57e3db14035c9fce38966f61e55971.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec4e5c9a2fbb080717f02ce7539df2f.png)
您最近一年使用:0次
2020-05-13更新
|
1080次组卷
|
15卷引用:2017届上海市虹口区高三4月期中教学质量监控(二模)数学试卷
2017届上海市虹口区高三4月期中教学质量监控(二模)数学试卷2017届上海市虹口区高考二模数学试题江西省宜春市高安中学2019-2020学年高一上学期期中数学(A)试题(已下线)上海市华师大二附中2019-2020学年高一下学期期中数学试题(已下线)上海市华东师范大学第二附属中学2019-2020学年高一下学期4月月考数学试题山西省怀仁市2021届高三上学期期中数学(理)试题(已下线)考点03 三角函数与解三角形-2021年高考数学【热点·重点·难点】专练(上海专用)(已下线)第7章 三角函数【真题训练】-2020-2021学年新教材高一数学下册单元复习一遍过(沪教版2020必修第二册)(已下线)第9讲期中复习(练习)提升卷-【教育机构专用】2021年春季高一数学辅导讲义(沪教版2020必修第二册)(已下线)第7讲 函数y=Asin+(wx+φ)的函数的图像(练习)-【教育机构专用】2021年春季高一数学辅导讲义(沪教版2020必修第二册)(已下线)第19讲压轴综合题(讲义)-【教育机构专用】2021年春季高一数学辅导讲义(沪教版2020必修第二册)(已下线)上海期末真题精选50题(大题压轴版)-2020-2021学年高一数学下册期中期末考试高分直通车(沪教版2020必修第二册)(已下线)期中重难点突破专题01-【尖子生专用】2021-2022学年高一数学考点培优训练(人教A版2019必修第一册)上海市实验学校2022届高三冲刺模拟卷5数学试题(已下线)专题06 三角函数(模拟练)-2
名校
解题方法
5 . 设正数数列
的前
项之和为
,数列
的前
项之积为
,且
,则数列
的前
项和
中大于2016的最小项为第______ 项.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/686ece75006ad358f23314dc8a246e11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c59e7c7a84a4bdb959e95536d0404ceb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c5175f3097ba91a11fc64feb1f272c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7664455e4735a48ba5724a9b9544530f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
您最近一年使用:0次
2020-02-10更新
|
344次组卷
|
3卷引用:上海市外国语大学附属外国语学校2020-2021学年高二上学期12月月考数学试题
名校
6 . 已知点列
均在函数
图像上,点列
满足
,若数列
中任意连续三项能构成三角形的三边,则
的范围为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d0b3abb42b47bbb3879e1b9555825a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d018d0b5d1970404a82d6dc0d5e1771c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/137a5c7fceb9cc04a1572d74be5df001.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69da45a8578cded4197cb3f3121718fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
2020-01-30更新
|
571次组卷
|
5卷引用:2016届上海市虹口区高三4月高考练习(二模)(理)数学试题
名校
7 . 若数列
同时满足条件:①存在互异的
使得
(
为常数);
②当
且
时,对任意
都有
,则称数列
为双底数列.
(1)判断以下数列
是否为双底数列(只需写出结论不必证明);
①
; ②
; ③![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80dc168c1f4e1e671eab68e571aa6268.png)
(2)设
,若数列
是双底数列,求实数
的值以及数列
的前
项和
;
(3)设
,是否存在整数
,使得数列
为双底数列?若存在,求出所有的
的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aef5d13d72b2c4b409dddfa9e7a14538.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8b4417ada698e17e1b6dd52952ed3b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfa6aa6cd89ae8b194a419f3048e42a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4786a812454905007f56b8230b0e7672.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e145b6046bc80d0ffecc61ac67c87ca1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81e4c56d50716486d4a1c3088a9b6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(1)判断以下数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ed6c0ce2a35508de1b61fec2d268cdf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc150cfe321e5601480c07674cb7f811.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80dc168c1f4e1e671eab68e571aa6268.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33878d46997d8182a8c60e3d22376749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa4dc5a6738499f731d6a5b8009d5209.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
您最近一年使用:0次
2018-04-21更新
|
744次组卷
|
4卷引用:上海市鲁迅中学2018-2019学年高三上学期期中数学试题
名校
8 . 已知数列
是共有k个项的有限数列,且满足
,若
,
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd707b69a11f8de5566f23c1a2a9ff5a.png)
_ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ada1eec8fad5f0484ecbfc4a7eae8576.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c339234052548a53ce660908f38a1210.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55c671970b60a13b631a7c547c27315d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433eaf536c1fed0f48f4af7b595a2af4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd707b69a11f8de5566f23c1a2a9ff5a.png)
您最近一年使用:0次
2018-04-15更新
|
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4卷引用:上海市外国语大学附属外国语学校2023-2024学年高二上学期9月月考数学试题
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